Laci Peterson was the 27-year-old substitute teacher who was murdered in 2002 while she was eight months pregnant with her first child, Connor. She was missing for four months before her body was found. Her husband Scott Peterson, who was having an affair at the time with Amber Frey (he told Frey he was a widower), was convicted of both Laci’s murder and their prenatal son Connor’s murder. Scott Peterson, now 44, is on death row at San Quentin State Prison. (Note: California has not had an execution since 2006.)

In July 2012, Peterson’s lawyer Cliff Gardner “filed a 423-page appeal of his sentence, citing a jury affected by hostile publicity, a flimsy case, and the use of unreliable dog-sniffing evidence.” Peterson’s case is on appeal to the Supreme Court of California. On April 21, Dateline will air “newly unearthed interrogation video of Scott Peterson and an interview with retired Modesto Police Detective Allen Brocchini.” Dateline airs Fridays at 9pm on NBC.